iOS中如何使用WKWebView仿微信加载进度条

这篇文章主要介绍了iOS中如何使用WKWebView仿微信加载进度条，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。

具体内容如下

WKWebView添加了estimatedProgress属性（double类型），我们可以利用该属性来设置UIProgressView

github代码仓库上存放的Demo

为页面添加UIProgressView属性

@property (nonatomic, strong) WKWebView *mywebView;@property (nonatomic, strong) UIProgressView *progressView;//设置加载进度条

懒加载UIProgressView

-(UIProgressView *)progressView{ if (!_progressView) { _progressView = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault]; _progressView.frame = CGRectMake(0, 64, screen_width, 5); [_progressView setTrackTintColor:[UIColor colorWithRed:240.0/255 green:240.0/255 blue:240.0/255 alpha:1.0]]; _progressView.progressTintColor = [UIColor greenColor]; } return _progressView;}

在初始化WKWebView时（我是在懒加载时） kvo 添加监控

[_mywebView addObserver:self forKeyPath:NSStringFromSelector(@selector(estimatedProgress)) options:0 context:nil];

页面开始加载时，隐藏进度条

//开始加载-(void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation{ //开始加载的时候，让进度条显示 self.progressView.hidden = NO;}

kvo 监听进度

//kvo 监听进度-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{ if ([keyPath isEqualToString:NSStringFromSelector(@selector(estimatedProgress))] && object == self.mywebView) { [self.progressView setAlpha:1.0f]; BOOL animated = self.mywebView.estimatedProgress > self.progressView.progress; [self.progressView setProgress:self.mywebView.estimatedProgress animated:animated]; if (self.mywebView.estimatedProgress >= 1.0f) { [UIView animateWithDuration:0.3f delay:0.3f options:UIViewAnimationOptionCurveEaseOut animations:^{ [self.progressView setAlpha:0.0f]; } completion:^(BOOL finished) { [self.progressView setProgress:0.0f animated:NO]; }]; } }else{ [super observeValueForKeyPath:keyPath ofObject:object change:change context:context]; }}

在dealloc方法里移除监听

-(void)dealloc{ [self.mywebView removeObserver:self forKeyPath:NSStringFromSelector(@selector(estimatedProgress))];}

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